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Vulnerability record · CVE-2026-27699 · published 25 February 2026

CVE-2026-27699: Patrickjuchli basic-ftp path traversal vulnerability

Patrickjuchli · Basic Ftp

The `basic-ftp` FTP client library for Node.js contains a path traversal vulnerability (CWE-22) in versions prior to 5.2.0 in the `downloadToDir()` method. A malicious FTP server can send directory listings with filenames containing path traversal sequences (`../`) that cause files to be written outside the intended download directory. Version 5.2.0 patches the issue.

9.8 CVSS 3.1 Critical EPSS 1.0% · top 38.4% CWE-22 · Path traversal
9.8CVSS 3.1 base score
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

The `basic-ftp` FTP client library for Node.js contains a path traversal vulnerability (CWE-22) in versions prior to 5.2.0 in the `downloadToDir()` method. A malicious FTP server can send directory listings with filenames containing path traversal sequences (`../`) that cause files to be written outside the intended download directory. Version 5.2.0 patches the issue.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/patrickjuchli/basic-ftp/commit/2a2a0e6514357b9eda07c2f8afbd3f04727a7cd9 Patch
https://github.com/patrickjuchli/basic-ftp/releases/tag/v5.2.0 Release Notes
https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-5rq4-664w-9x2c ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-27699), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.